/*
 * Copyright 2012 Marsrutai.lt
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package lt.marsrutai.mobile.android.util;

import java.util.Calendar;
import java.util.Comparator;

/**
 * Compares only hours and minutes of two Calendar instances
 *
 * @author Martynas
 */
public class CalendarHourMinuteComparator implements Comparator<Calendar> {

    public static final CalendarHourMinuteComparator INSTANCE = new CalendarHourMinuteComparator();

    @Override
    public int compare(Calendar cal1, Calendar cal2) {
        final int BEFORE = -1;
        final int EQUAL = 0;
        final int AFTER = 1;

        if (cal1 == cal2) {
            return EQUAL;
        }

        if (cal1.get(Calendar.HOUR_OF_DAY) < cal2.get(Calendar.HOUR_OF_DAY)) {
            return BEFORE;
        }
        else if (cal1.get(Calendar.HOUR_OF_DAY) > cal2.get(Calendar.HOUR_OF_DAY)) {
            return AFTER;
        }
        else if (cal1.get(Calendar.MINUTE) < cal2.get(Calendar.MINUTE)) {
            return BEFORE;
        }
        else if (cal1.get(Calendar.MINUTE) > cal2.get(Calendar.MINUTE)) {
            return AFTER;
        }
        else {
            return EQUAL;
        }
    }

}
